Synthesis, crystal structure and magnetic properties of poly[[diaqua{μ(6)-2-[bis­(carboxyl­atometh­yl)amino]­terephthalato}­dicobalt(II)] 1.6-hydrate]

The asymmetric unit of the polymeric title compound {[Co(2)(C(12)H(7)NO(8))(H(2)O)(2)]·1.6H(2)O}(n) comprises two Co(II) ions, which are coordinated by fully deprotonated 2-aminodi­acetic terephthalic acid (adtp(4–)) and terminal water mol­ecules in distorted octa­hedral N(1)O(5) and O(6) coordination environments. The title compound features tetra­nuclear Co(II) units bridged by κ (3) O:O:O′- and κ (3) O:O,O′-carboxyl­ate groups, which are joined into ribbons via syn–anti carboxyl­ate bridges. The parallel adtp(4–) ligands with an alternately reversed arrangement further link adjacent Co(II) ribbons into (010) layers, which are assembled into a three-dimensional supra­molecular network via inter­molecular hydrogen bonds. The disordered water solvent mol­ecules are situated in channels parallel to [100]. Magnetic measurements and analyses reveal that the title compound displays anti­ferromagnetic behaviour. The purity of the title compound was characterized by X-ray powder diffraction.